3969909 has 6 divisors (see below), whose sum is σ = 5734326. Its totient is φ = 2646600.

The previous prime is 3969899. The next prime is 3969923. The reversal of 3969909 is 9099693.

It can be written as a sum of positive squares in only one way, i.e., 3294225 + 675684 = 1815^2 + 822^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3969909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3969709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220542 + ... + 220559.

It is an arithmetic number, because the mean of its divisors is an integer number (955721).

Almost surely, 2^3969909 is an apocalyptic number.

It is an amenable number.

3969909 is a deficient number, since it is larger than the sum of its proper divisors (1764417).

3969909 is a wasteful number, since it uses less digits than its factorization.

3969909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441107 (or 441104 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 3969909 is about 1992.4630485909. The cubic root of 3969909 is about 158.3410488084.

The spelling of 3969909 in words is "three million, nine hundred sixty-nine thousand, nine hundred nine".